Check if a listener has already been added to a button?

I've run into a bit of a snag with creating a button in the editor.

I need to dynamically add listeners to my button, but it just keeps adding the same 3 listeners over and over because there is nothing stopping it from adding the same ones on each Awake.

Here is my code...

         var button = gameObject.GetComponent<Button>();
             
         if (receiver1 != null)
         {
             var go1 = receiver1;
             UnityAction<GameObject> action1 = new UnityAction<GameObject>(this.OnClickEvent1);
              UnityEventTools.AddObjectPersistentListener<GameObject>(button.onClick, action1, go1);            
         }
             
         if (receiver2 != null)
         {
             var go2 = receiver2;
             UnityAction<GameObject> action2 = new UnityAction<GameObject>(this.OnClickEvent2);
              UnityEventTools.AddObjectPersistentListener<GameObject>(button.onClick, action2, go2);            
         }
             
         if (receiver3 != null)
         {
             var go3 = receiver3;
             UnityAction<GameObject> action3 = new UnityAction<GameObject>(this.OnClickEvent3);
              UnityEventTools.AddObjectPersistentListener<GameObject>(button.onClick, action3, go3);           
         }

Any help is appreciated!